Fuel injector having novel multiple orifice disk members

A fuel injector for injecting fuel into an internal combustion engine comprising:

• a body,
• a fuel passageway through said body leading to a nozzle from which fuel is injected,
• a valve seat disposed internally of said body within said passageway,
• a valve element that is reciprocated relative to said valve seat to close and open said passageway to flow by seating and unseating said valve element on and from said valve seat, and
• at least two thin disk orifice members disposed in said passageway between said valve seat and said nozzle, said thin disk orifice members being fabricated from a metallic material are stacked face-to-face to abut around their perimeters at least one of which is shaped in its central region to cooperatively define between themselves a walled chamber space,
• one of said orifice disk members comprises a plurality of through-orifices extending into said chamber space to place said chamber space in fluid communication with said fuel passageway and the other of said orifice disk members having a plurality of through-orifices extending into said chamber space to place said chamber space in fluid communication with said nozzle, each one of said through-orifices in said one orifice disk member has a larger flow area than each one of said through-orifices in said other orifice disk member:
• so that fuel that has passed through said valve seat passes through said chamber space before it is ejected from said nozzle.